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Title: CMB anomalies after Planck

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Publication Date:
Sponsoring Org.:
OSTI Identifier:
Grant/Contract Number:
FG02-95ER40899; DOE-SC0009946
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Classical and Quantum Gravity
Additional Journal Information:
Journal Volume: 33; Journal Issue: 18; Related Information: CHORUS Timestamp: 2016-08-20 03:30:06; Journal ID: ISSN 0264-9381
IOP Publishing
Country of Publication:
United Kingdom

Citation Formats

Schwarz, Dominik J., Copi, Craig J., Huterer, Dragan, and Starkman, Glenn D. CMB anomalies after Planck. United Kingdom: N. p., 2016. Web. doi:10.1088/0264-9381/33/18/184001.
Schwarz, Dominik J., Copi, Craig J., Huterer, Dragan, & Starkman, Glenn D. CMB anomalies after Planck. United Kingdom. doi:10.1088/0264-9381/33/18/184001.
Schwarz, Dominik J., Copi, Craig J., Huterer, Dragan, and Starkman, Glenn D. 2016. "CMB anomalies after Planck". United Kingdom. doi:10.1088/0264-9381/33/18/184001.
title = {CMB anomalies after Planck},
author = {Schwarz, Dominik J. and Copi, Craig J. and Huterer, Dragan and Starkman, Glenn D.},
abstractNote = {},
doi = {10.1088/0264-9381/33/18/184001},
journal = {Classical and Quantum Gravity},
number = 18,
volume = 33,
place = {United Kingdom},
year = 2016,
month = 8

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1088/0264-9381/33/18/184001

Citation Metrics:
Cited by: 14works
Citation information provided by
Web of Science

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  • Large-scale anomalies have been reported in CMB data with both WMAP and Planck data. These could be due to foreground residuals and or systematic effects, though their confirmation with Planck data suggests they are not due to a problem in the WMAP or Planck pipelines. If these anomalies are in fact primordial, then understanding their origin is fundamental to either validate the standard model of cosmology or to explore new physics. We investigate three other possible issues: 1) the trade-off between minimising systematics due to foreground contamination (with a conservative mask) and minimising systematics due to masking, 2) astrophysical secondarymore » effects (the kinetic Doppler quadrupole and kinetic Sunyaev-Zel'dovich effect), and 3) secondary cosmological signals (the integrated Sachs-Wolfe effect). We address the masking issue by considering new procedures that use both WMAP and Planck to produce higher quality full-sky maps using the sparsity methodology (LGMCA maps). We show the impact of masking is dominant over that of residual foregrounds, and the LGMCA full-sky maps can be used without further processing to study anomalies. We consider four official Planck PR1 and two LGMCA CMB maps. Analysis of the observed CMB maps shows that only the low quadrupole and quadrupole-octopole alignment seem significant, but that the planar octopole, Axis of Evil, mirror parity and cold spot are not significant in nearly all maps considered. After subtraction of astrophysical and cosmological secondary effects, only the low quadrupole may still be considered anomalous, meaning the significance of only one anomaly is affected by secondary effect subtraction out of six anomalies considered. In the spirit of reproducible research all reconstructed maps and codes will be made available for download here« less
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  • We revisit spectator field models including curvaton and modulated reheating scenarios, specifically focusing on their viability in the new Planck era, based on the derived expression for the spectral index in general spectator field models. Importantly, the recent Planck observations give strong preference to a red-tilted power spectrum, while the spectator field models tend to predict a scale-invariant one. This implies that, during inflation, either (i) the Hubble parameter varies significantly as in chaotic inflation, or (ii) a scalar potential for the spectator field has a relatively large negative curvature. Combined with the tight constraint on the non-Gaussianity, the Planckmore » data provides us with rich implications for various spectator field models.« less